Fish Can Think Logically Finds New Research

Posted: Aug 5 2015, 3:30am CDT | by , Updated: Aug 5 2015, 3:35am CDT, in Report | Latest Science News


Fish Can Think Logically Finds new Research
Julidochromis transcriptus Wikipedia / Photo Credit: Przemysław Malkowski

A new stunning study comes out of Japan that shows intelligence of fish.

A Japanese research team at the Osaka City University proofs that fish can think logically. This study is not about dolphins, which are in fact mammals and known known to be intelligent. This study uses tiny cichlid fish.

These small fish from Africa are highly social. They pick a fight right away to determine the hacking order. The scientists used this aggressive social behavior to conduct an interesting experiment. 

Chilid Fish Fight

Two cichlid fishes are seen fighting
during a research by Osaka City University Prof. Masanori Kohda.
Masanori Kohda/Osaka City University

Two male cichlid fish similar in size fight in an tank for 30 minutes. The looser, C, got then put in a separate tank to watch the winning fish, B, fight with a new fish, A.

When A defeated B in the second fight, C tried to avoid fighting A when put back together. C had no direct experience fighting A, but he saw his strength and concludes that he does not stand a chance - good thinking!

"Fish were believed to be simple animals, but this shows that they are far more intelligent in decision-making than expected," Prof. Kohda told Japan Real Time on Wednesday. “We have only tested this with cichlid fish, but it is highly likely that other similar types will also show the same reaction.”

The full study titled: "The use of multiple sources of social information in contest behavior: testing the social cognitive abilities of a cichlid fish" has been released in Frontiers in Ecology and Evolution.

The masked julie (Julidochromis transcriptus) is a species of cichlid endemic to Lake Tanganyika in Africa where it is found only along the northwestern shore preferring areas with rocky substrates. They eat zooplankton and benthic invertebrates found in the algae growth in the wild. This species reaches a length of 7 centimeters (2.8 in) according to Wikipedia.

See also the research about Self Awareness in animals.

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